Abstract
RsSymEG, an endoglucanase of glycosyl hydrolase family (GHF) 7 encoded by a transcript isolated from the symbiotic protist of the termite Reticulitermes speratus, is expressed in Aspergillus oryzae. Interestingly, purified RsSymEG1 has a relatively higher specific activity (603 micromol min(-1) mg(-1) protein) and V(max) value (769.6 unit/mg protein) than previously reported data for GHF7 endoglucanase of Trichoderma ressei. It also has the same K(m) value (1.97 mg/ml) with Clostridium cellulolyticum enzymes that contain cellulose binding module, a property indicative of high affinity to substrate, though no cellulose binding module is found within it. Thin-layer chromatography analysis revealed that RsSymEG1 preferentially hydrolyzes the beta-1,4-cellulosic linkage of cellodextrins into cellobiose and glucose.
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